Roots of Polynomial The number c is a root of a polynomial p(x), if p(c)=0.
3 G W7 y f7 ]2 @5 K* e; A& A An n-th order polynomial has n complex roots.! u' A2 ?5 j G. Q% n" J! I
Example:& P& D! x5 ~: a( _0 x
2 is a root of polynomial p(x)=x-2,since p(2)=2-2=0.7 f# x' G3 |. t* E5 p0 c' p) v
1 is a root of polynomial p(x)=x2-3x+2,since p(1)=12-3*1+2=0./ M& f: ?1 B k4 n
Remember:& c! B: |; N8 f( M7 [3 U
A polynomial may not have any real root:p(x)=x2+1 does not have any real root, since p(x)>=1 for all real x.' K& u& ?2 O5 R0 ~
由于美国数学基础教育的难度增加导致数学考试越来越难,但新gre数学复习考点都是高中时候学到的知识点,考生不要过于紧张,把基本概念弄明白,再记住一些新版gre数学必备的词汇,那么相信新版gre数学应该没有问题。 |